What type of grounding should be avoided in electrical line work?

Metal grounding should be avoided in electrical line work primarily because it presents the risk of creating a path for fault currents that could be dangerous to workers. When metal grounding is employed, it can inadvertently connect to other conductive materials, increasing the chance of shock or electrocution in the event of a fault. The goal of grounding in electrical line work is to ensure safety by directing excess electricity safely into the ground, but metal grounding can compromise that safety by providing an unintended route for current.

In contrast, equipotential grounding aims to ensure that all conductive parts are at the same potential, which greatly reduces the risk of shock. Dual grounding is used to enhance reliability and safety by providing multiple grounding points, which can enhance protection against surge events. Isolated grounding is typically used in specific applications to prevent ground loops, thus offering a safer scenario when properly implemented. Each of these methods has safety measures built into their design, distinguishing them from metal grounding, which lacks those protective features in line work settings.